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499f5480f1
We have to make sure to avoid alpha-blending issues by explicitly switching to `gdEffectReplace` and to restore the old value afterwards. This is a port of <https://github.com/libgd/libgd/commit/a7a7ece>.
32 lines
877 B
PHP
32 lines
877 B
PHP
--TEST--
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Bug #75124 (gdImageGrayScale() may produce colors)
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--SKIPIF--
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<?php
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if (!extension_loaded('gd')) die('gd extension not available');
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if (!GD_BUNDLED && version_compare(GD_VERSION, '2.2.5', '<')) {
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die('skip only for bundled libgd or external libgd >= 2.2.5');
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}
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?>
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--FILE--
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<?php
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$im = imagecreatefrompng(__DIR__ . '/bug75124.png');
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var_dump(imageistruecolor($im));
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imagefilter($im, IMG_FILTER_GRAYSCALE);
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for ($i = 0, $width = imagesx($im); $i < $width; $i ++) {
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for ($j = 0, $height = imagesy($im); $j < $height; $j++) {
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$color = imagecolorat($im, $i, $j);
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$red = ($color >> 16) & 0xff;
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$green = ($color >> 8) & 0xff;
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$blue = $color & 0xff;
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if ($red != $green || $green != $blue) {
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echo "non grayscale pixel detected\n";
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break 2;
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}
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}
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}
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?>
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===DONE===
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--EXPECT--
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bool(true)
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===DONE===
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